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It comes in to effect at midday on Saturday.
Most of the country will be affected by a status yellow thunderstorm and rain warning tomorrow.
The alert will impact all of Leinster, including Kildare, as well as the counties of Cavan, Donegal and Monaghan.
Met Eireann is forecasting heavy showers with localised thundery downpours that could lead to spot flooding.
The warning will come in to effect at 12pm tomorrow and last until 8pm.
Status Yellow - Thunderstorm and Rain warning for Leinster, Cavan, Donegal, Monaghanhttps://t.co/l8JdKfwZt9
— Met Éireann (@MetEireann) August 20, 2021
Scattered heavy showers with localised thundery downpours will give a risk of spot flooding.
Valid: 12:00 Saturday 21/08/2021 to 20:00 Saturday 21/08/2021 pic.twitter.com/M4XsfZ3ZQw